CODEWITHSUNDEEP
djangoforeign-keysmany-to-many
DANISH ANGURAL
DANISH ANGURAL

Reputation: 27

how to have multiple relations between two models in django

im new to django and was trying to create models for a youtube like website. im trying to create models such that a user has record of:

1) playlists he has uploaded.

2) playlists he has viewed. i tried the following models:

class User(models.Model):
name=models.CharField
email=models.EmailField
password=models.CharField
isTeacher=models.BooleanField
upvotes=models.IntegerField

class Playlists(models.Model):
creator=models.ForeignKey(User, on_delete=models.CASCADE)
viewed_by=models.ManyToManyField(User, on_delete=models.CASCADE)
name=models.CharField
size=models.IntegerField

i hope you get what i want to do. obvoiusly this scheme doesn't work. but i want to do something on similar grounds

Upvotes: 0

Views: 63

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 477684

That can work, but you need to specify different values for the related_name=… parameter [Django-doc], this is the name of the relation in reverse, so you can construct such model with:

from django.conf import settings

class Playlists(models.Model):
    creator = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='created_playlists'
    )
    viewed_by = models.ManyToManyField(
        settings.AUTH_USER_MODEL,
        related_name='viewed_playlists'
    )
    name = models.CharField(max_length=128)
    size = models.IntegerField()

Note: It is normally better to make use of the settings.AUTH_USER_MODEL [Django-doc] to refer to the user model, than to use the User model [Django-doc] directly. For more information you can see the referencing the User model section of the documentation.

Upvotes: 1

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